Abstract

We present the first study of the photosensitivity of GeS binary glasses in response to irradiation to femtosecond pulses at 800nm. A maximum positive refractive index change of 3.5x10−3 is demonstrated with the possibility to control the waveguide diameter from ~8 to ~50 µm by adjusting the input pulse energy. It is also demonstrated that under different exposure conditions, a maximum negative index change of −7.5x10−3 can be reached. The present results clearly illustrate the potential of this family of glasses for the fabrication of mid-infrared waveguides.